mypizzas = ['pizza_1', 'pizza_2', 'pizza_3']
friend_pizzas = mypizzas[:]
mypizzas.append('pizza_4')
friend_pizzas.append('印度飞饼')
for m, f in zip(mypizzas, friend_pizzas):
    print(f'mypizzas={m},friend_pizzas={f}')
